#define  _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdbool.h>
struct TreeNode
{
    int val;
    struct TreeNode* left;
    struct TreeNode* right;
};
bool isSameTree(struct TreeNode* p, struct TreeNode* q)
{
    if (p == NULL && q == NULL)
    {
        return true;
    }
    if ((p == NULL && q != NULL) || (p != NULL && q == NULL))
    {
        return false;
    }
    if (p->val != q->val)
    {
        return false;
    }
    return isSameTree(p->left, q->right) && isSameTree(p->right, q->left);
}
bool isSymmetric(struct TreeNode* root)
{
    return isSameTree(root->left, root->right);
}